Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Puttable Arrangements - Common and Preferred Stock	Series A Convertible Redeemable Preferred Stock	Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature	Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional paid-in capital	Additional paid-in capital Puttable Arrangements - Common and Preferred Stock	Additional paid-in capital Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature	(Accumulated deficit) retained earnings	(Accumulated deficit) retained earnings Puttable Arrangements - Common and Preferred Stock	Accumulated other comprehensive (loss) income	Accumulated other comprehensive (loss) income Series A Convertible Redeemable Preferred Stock	Accumulated other comprehensive (loss) income Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature	Non-controlling interests	Non-controlling interests Puttable Arrangements - Common and Preferred Stock	Non-controlling interests Series A Convertible Redeemable Preferred Stock
Balance of shares outstanding, beginning of period (in shares) at Dec. 31, 2015							133,255	0	0
Balance, beginning of period at Dec. 31, 2015	$ 355,426						$ 533	$ 0	$ 0	$ 2,686,451			$ (1,409,548)		$ (952,677)			$ 30,667
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash stock compensation (in shares)							0
Non-cash stock compensation	$ 38,071									38,071
Exercise of stock options (in shares)	245						12
Exercise of stock options	$ 253									253
Vesting of restricted stock and exercise of stock options, net of shares withheld to satisfy tax withholding (in shares)							109
Change in noncontrolling interests	(1,725)						$ 1			(1,726)
Dividends to noncontrolling interests	(1,164)									(1,164)								0
Capital contributions from noncontrolling interest holders	5,572																	5,572
Changes in noncontrolling interests	3,104									1,003					0			2,101
Accretion of redeemable noncontrolling interests and equity	263				$ (1,719)					263
Reclassification of redeemable noncontrolling interests and equity	(613)																	(613)
Net income	366,186												371,847					(5,661)
Foreign currency translation adjustment, net of tax of $0 for all years	(115,685)														(115,801)			116
Unrealized gain on derivative instruments, net of tax of $0 for all years	8,032														8,032
Minimum pension liability adjustment, net of tax of $144, $105 and $1,800, respectively	8,391														8,391
Balance of shares outstanding, end of period (in shares) at Dec. 31, 2016							133,376	0	0
Balance, end of period at Dec. 31, 2016	664,392						$ 534	$ 0	$ 0	2,721,432			(1,037,701)		(1,052,055)			32,182
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash stock compensation	$ 64,788									64,788
Exercise of stock options (in shares)	0
Reclassification of Common stock into Class B common stock on January 31, 2017 (in shares)							(133,376)		133,376
Conversion of Class B shares to Class A shares							$ (534)		$ 534
Issuance of Class A common stock in initial public offering (in shares)								35,000
Exercise of stock options	$ 456,359							$ 140		456,219
Conversion of Class B shares to Class A shares (in shares)								1,229	(1,229)
Vesting of restricted stock and restricted stock units, net of shares withheld to satisfy tax withholding								$ 5	$ (5)
Note exchange transaction (in shares)								18,683
Distributions from noncontrolling interest holders	245,747							$ 75		245,672
Vesting of restricted stock and exercise of stock options, net of shares withheld to satisfy tax withholding (in shares)								140	296
Change in noncontrolling interests	(2,151)								$ 1	(2,152)
Reclassification to equity upon expiration of put right on share-based awards	5,500									5,500
Dividends to noncontrolling interests	(1,419)									(1,419)
Accretion of Series A Preferred Stock	167																	167
Changes in noncontrolling interests	(36,617)									(11,569)					(1,164)			(23,884)
Accretion of redeemable noncontrolling interests and equity				$ (5,183)	(292,450)	$ 265,368					$ (5,183)	$ 265,368
Reclassification of redeemable noncontrolling interests and equity	(917)																	(917)
Net income	93,764												91,465					2,299
Foreign currency translation adjustment, net of tax of $0 for all years	120,436														118,165			2,271
Unrealized gain on derivative instruments, net of tax of $0 for all years	9,875														9,875
Minimum pension liability adjustment, net of tax of $144, $105 and $1,800, respectively	$ (377)														(377)
Balance of shares outstanding, end of period (in shares) at Dec. 31, 2017	133,376	55,052	132,443				0	55,052	132,443
Balance, end of period at Dec. 31, 2017	$ 1,587,282						$ 0	$ 220	$ 530	3,446,206			(946,236)		(925,556)			12,118
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash stock compensation	$ 10,791									10,791
Exercise of stock options (in shares)	0
Reclassification of Common stock into Class B common stock on January 31, 2017 (in shares)								15,638	(15,638)
Conversion of Class B shares to Class A shares								$ 63	$ (63)
Conversion of Class B shares to Class A shares (in shares)								617	60
Vesting of restricted stock and restricted stock units, net of shares withheld to satisfy tax withholding	$ (2,528)							$ 3		(2,531)
Distributions from noncontrolling interest holders	334									0								334
Change in noncontrolling interests	(23,776)									(471)								(23,305)
Gain upon conversion of Series A Preferred Stock	74,110									74,110
Reclassification of Series A Preferred Stock upon conversion	238,101							$ 144		237,957
Dividends to noncontrolling interests	(292)									(292)
Accretion of Series A Preferred Stock	61,974
Changes in noncontrolling interests	(635)									(471)								(635)
Accretion of redeemable noncontrolling interests and equity				$ 370,930	$ (200,006)	$ 13,709								$ 370,067		$ (200,498)	$ 13,709		$ 863	$ 492
Reclassification of redeemable noncontrolling interests and equity	(350)														(350)
Net income	370,930
Foreign currency translation adjustment, net of tax of $0 for all years	(200,006)
Unrealized gain on derivative instruments, net of tax of $0 for all years	13,709
Minimum pension liability adjustment, net of tax of $144, $105 and $1,800, respectively	$ (350)
Balance of shares outstanding, end of period (in shares) at Dec. 31, 2018	0	107,450	116,865					107,450	116,865
Balance, end of period at Dec. 31, 2018	$ 2,050,946							$ 430	$ 467	$ 3,703,796			$ (530,919)		$ (1,112,695)			$ (10,133)